祝融火星車蘇醒 Zhurong wake up from hibernation

國家航天局探月與航天工程中心5月20日指出，為應對沙塵天氣導致的太陽翼發電能力降低及冬季極低的環境溫度，按照設計方案和飛控策略，火星車5月18日轉入休眠模式。

預計今年12月前後，祝融號巡視區將進入初春季節，環境條件好轉後，將恢復正常工作。

it's the time when the axis of Martian rotation is perpendicular to the direction of the Sun and the northern hemisphere is headed into summer (making it the autumnal equinox for the southern hemisphere), ie 25~26 Dec

航天科技集团五院天问一号探测器系统副总设计师贾阳：一个是能源够不够，必须测到它的能量大于140瓦之后。第二个条件就是温度，必须保证它要工作的像电池等的温度提高到负的15℃(5 deg F)

以上。两个条件具备了，车自然就醒过来了。

Btw，一般 high end CCD camera 操作溫度: 50 to -30 deg C.

所以車上基本系統（essential system) 理論與上應在-30 deg c 以上能有限度的操作的。

Apr 2023

張榮橋:

2023年1月中旬，火星车的舱内温度已经可以达到唤醒要求，但太阳光照强度还没有达到火星车发电量的最低需求

最大可能是不可預知的火星沙塵累積，從而降低了發電能力，不足以使其甦醒。

張又指，如果超過原來設計塵積的20%，發電能力並不足夠；超過原來預想的30%，就可能要到太陽光照最強的時候（火星夏至）才具備發電能力；

超出承受能力的40%，火星車就永遠喚不醒

9 Jan 2023

Spacenews update. Zhurong seems to have lost contact

22 Feb 2023, NASA HiRise twitter

From HiRise of MRO, 8 Sep 2022 and 7 Feb 2023

The photo showed Zhurong, but covered with more dust.

10/2/2023 wechat 並沒交待火星車最新近況

Summer solstice 2023 on Mars is 12 July (Ls=90 deg)

29/8/2023

From Mars Perseverance, it's now over 5 degrees F for 3 days. Since 25 Aug

29 Sep 2023

Mars weather now is around 8 deg F max, or above.

Mid summer will be around 12 Oct, after that temperature will start to fall.

Nov 2023

Average 9 deg F, even 14 deg F max on one day.

18 Nov 2023

Mars at solar conjunction for two weeks.

Huanqiu

Mars weather forecast

Perseverance Mars weather

Planetary ( use 44 App_Lon_Sun on JPL Horizons)

MarsWxReport tweet

IMCCE

BJD 25/4/23

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